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Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.91 by root, Sun Nov 11 00:06:48 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# define EV_USE_MONOTONIC 1
		41	# define EV_USE_REALTIME 1
		42	# endif
		43
		44	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		45	# define EV_USE_SELECT 1
		46	# endif
		47
		48	# if HAVE_POLL && HAVE_POLL_H
		49	# define EV_USE_POLL 1
		50	# endif
		51
		52	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		53	# define EV_USE_EPOLL 1
		54	# endif
		55
		56	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		57	# define EV_USE_KQUEUE 1
		58	# endif
		59
		60	#endif
		61
1	#include <math.h>	62	#include <math.h>
2	#include <stdlib.h>	63	#include <stdlib.h>
		64	#include <fcntl.h>
		65	#include <stddef.h>
3		66
4	#include <stdio.h>	67	#include <stdio.h>
5		68
		69	#include <assert.h>
6	#include <errno.h>	70	#include <errno.h>
7	#include <sys/time.h>	71	#include <sys/types.h>
8	#include <time.h>	72	#include <time.h>
9		73
		74	#include <signal.h>
		75
		76	#ifndef WIN32
		77	# include <unistd.h>
		78	# include <sys/time.h>
		79	# include <sys/wait.h>
		80	#endif
		81	/**/
		82
		83	#ifndef EV_USE_MONOTONIC
		84	# define EV_USE_MONOTONIC 1
		85	#endif
		86
		87	#ifndef EV_USE_SELECT
		88	# define EV_USE_SELECT 1
		89	#endif
		90
		91	#ifndef EV_USE_POLL
		92	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		93	#endif
		94
		95	#ifndef EV_USE_EPOLL
		96	# define EV_USE_EPOLL 0
		97	#endif
		98
		99	#ifndef EV_USE_KQUEUE
		100	# define EV_USE_KQUEUE 0
		101	#endif
		102
		103	#ifndef EV_USE_WIN32
		104	# ifdef WIN32
		105	# define EV_USE_WIN32 0 /* it does not exist, use select */
		106	# undef EV_USE_SELECT
		107	# define EV_USE_SELECT 1
		108	# else
		109	# define EV_USE_WIN32 0
		110	# endif
		111	#endif
		112
		113	#ifndef EV_USE_REALTIME
		114	# define EV_USE_REALTIME 1
		115	#endif
		116
		117	/**/
		118
10	#ifdef CLOCK_MONOTONIC	119	#ifndef CLOCK_MONOTONIC
		120	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	121	# define EV_USE_MONOTONIC 0
12	#endif	122	#endif
13		123
14	#define HAVE_EPOLL 1	124	#ifndef CLOCK_REALTIME
		125	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	126	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	127	#endif
17		128
18	#define MAX_BLOCKTIME 60.	129	/**/
19		130
		131	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		132	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		133	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		134	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
		135
		136	#ifdef EV_H
		137	# include EV_H
		138	#else
20	#include "ev.h"	139	# include "ev.h"
		140	#endif
21		141
		142	#if __GNUC__ >= 3
		143	# define expect(expr,value) __builtin_expect ((expr),(value))
		144	# define inline inline
		145	#else
		146	# define expect(expr,value) (expr)
		147	# define inline static
		148	#endif
		149
		150	#define expect_false(expr) expect ((expr) != 0, 0)
		151	#define expect_true(expr) expect ((expr) != 0, 1)
		152
		153	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		154	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		155
22	struct ev_watcher {	156	typedef struct ev_watcher *W;
23	EV_WATCHER (ev_watcher);
24	};
25
26	struct ev_watcher_list {	157	typedef struct ev_watcher_list *WL;
27	EV_WATCHER_LIST (ev_watcher_list);	158	typedef struct ev_watcher_time *WT;
28	};
29		159
		160	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		161
		162	#include "ev_win32.c"
		163
		164	/*****************************************************************************/
		165
		166	static void (*syserr_cb)(const char *msg);
		167
		168	void ev_set_syserr_cb (void (*cb)(const char *msg))
		169	{
		170	syserr_cb = cb;
		171	}
		172
		173	static void
		174	syserr (const char *msg)
		175	{
		176	if (!msg)
		177	msg = "(libev) system error";
		178
		179	if (syserr_cb)
		180	syserr_cb (msg);
		181	else
		182	{
		183	perror (msg);
		184	abort ();
		185	}
		186	}
		187
		188	static void *(*alloc)(void *ptr, long size);
		189
		190	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		191	{
		192	alloc = cb;
		193	}
		194
		195	static void *
		196	ev_realloc (void *ptr, long size)
		197	{
		198	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		199
		200	if (!ptr && size)
		201	{
		202	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		203	abort ();
		204	}
		205
		206	return ptr;
		207	}
		208
		209	#define ev_malloc(size) ev_realloc (0, (size))
		210	#define ev_free(ptr) ev_realloc ((ptr), 0)
		211
		212	/*****************************************************************************/
		213
		214	typedef struct
		215	{
		216	WL head;
		217	unsigned char events;
		218	unsigned char reify;
		219	} ANFD;
		220
		221	typedef struct
		222	{
		223	W w;
		224	int events;
		225	} ANPENDING;
		226
		227	#if EV_MULTIPLICITY
		228
		229	struct ev_loop
		230	{
		231	ev_tstamp ev_rt_now;
		232	#define VAR(name,decl) decl;
		233	#include "ev_vars.h"
		234	#undef VAR
		235	};
		236	#include "ev_wrap.h"
		237
		238	struct ev_loop default_loop_struct;
		239	static struct ev_loop *default_loop;
		240
		241	#else
		242
30	ev_tstamp ev_now;	243	ev_tstamp ev_rt_now;
31	int ev_method;	244	#define VAR(name,decl) static decl;
		245	#include "ev_vars.h"
		246	#undef VAR
32		247
33	static int have_monotonic; /* runtime */	248	static int default_loop;
34		249
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	250	#endif
36	static void (*method_reify)(void);
37	static void (*method_poll)(ev_tstamp timeout);
38		251
39	ev_tstamp	252	/*****************************************************************************/
		253
		254	inline ev_tstamp
40	ev_time (void)	255	ev_time (void)
41	{	256	{
42	#if HAVE_REALTIME	257	#if EV_USE_REALTIME
43	struct timespec ts;	258	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	259	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	261	#else
47	struct timeval tv;	262	struct timeval tv;
48	gettimeofday (&tv, 0);	263	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	264	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	265	#endif
51	}	266	}
52		267
53	static ev_tstamp	268	inline ev_tstamp
54	get_clock (void)	269	get_clock (void)
55	{	270	{
56	#if HAVE_MONOTONIC	271	#if EV_USE_MONOTONIC
57	if (have_monotonic)	272	if (expect_true (have_monotonic))
58	{	273	{
59	struct timespec ts;	274	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	275	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	276	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	277	}
63	#endif	278	#endif
64		279
65	return ev_time ();	280	return ev_time ();
66	}	281	}
67		282
		283	#if EV_MULTIPLICITY
		284	ev_tstamp
		285	ev_now (EV_P)
		286	{
		287	return ev_rt_now;
		288	}
		289	#endif
		290
		291	#define array_roundsize(type,n) ((n) | 4 & ~3)
		292
68	#define array_needsize(base,cur,cnt,init) \	293	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	294	if (expect_false ((cnt) > cur)) \
70	{ \	295	{ \
71	int newcnt = cur ? cur << 1 : 16; \	296	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	297	do \
		298	{ \
		299	newcnt = array_roundsize (type, newcnt << 1); \
		300	} \
		301	while ((cnt) > newcnt); \
		302	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	303	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	304	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	305	cur = newcnt; \
76	}	306	}
77		307
78	typedef struct	308	#define array_slim(type,stem) \
79	{	309	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	310	{ \
81	unsigned char wev, rev; /* want, received event set */	311	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	312	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		313	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		314	}
83		315
84	static ANFD *anfds;	316	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
85	static int anfdmax;	317	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		318	#define array_free_microshit(stem) \
		319	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
86		320
87	static int *fdchanges;	321	#define array_free(stem, idx) \
88	static int fdchangemax, fdchangecnt;	322	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		323
		324	/*****************************************************************************/
89		325
90	static void	326	static void
91	anfds_init (ANFD *base, int count)	327	anfds_init (ANFD *base, int count)
92	{	328	{
93	while (count--)	329	while (count--)
94	{	330	{
95	base->head = 0;	331	base->head = 0;
96	base->wev = base->rev = EV_NONE;	332	base->events = EV_NONE;
		333	base->reify = 0;
		334
97	++base;	335	++base;
98	}	336	}
99	}	337	}
100		338
101	typedef struct	339	void
		340	ev_feed_event (EV_P_ void *w, int revents)
102	{	341	{
103	struct ev_watcher *w;	342	W w_ = (W)w;
104	int events;
105	} ANPENDING;
106		343
107	static ANPENDING *pendings;	344	if (w_->pending)
108	static int pendingmax, pendingcnt;	345	{
		346	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		347	return;
		348	}
109		349
110	static void
111	event (struct ev_watcher *w, int events)
112	{
113	w->pending = ++pendingcnt;	350	w_->pending = ++pendingcnt [ABSPRI (w_)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	351	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
115	pendings [pendingcnt - 1].w = w;	352	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
116	pendings [pendingcnt - 1].events = events;	353	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
117	}	354	}
118		355
119	static void	356	static void
		357	queue_events (EV_P_ W *events, int eventcnt, int type)
		358	{
		359	int i;
		360
		361	for (i = 0; i < eventcnt; ++i)
		362	ev_feed_event (EV_A_ events [i], type);
		363	}
		364
		365	inline void
120	fd_event (int fd, int events)	366	fd_event (EV_P_ int fd, int revents)
121	{	367	{
122	ANFD *anfd = anfds + fd;	368	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	369	struct ev_io *w;
124		370
125	for (w = anfd->head; w; w = w->next)	371	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	372	{
127	int ev = w->events & events;	373	int ev = w->events & revents;
128		374
129	if (ev)	375	if (ev)
130	event ((struct ev_watcher *)w, ev);	376	ev_feed_event (EV_A_ (W)w, ev);
		377	}
		378	}
		379
		380	void
		381	ev_feed_fd_event (EV_P_ int fd, int revents)
		382	{
		383	fd_event (EV_A_ fd, revents);
		384	}
		385
		386	/*****************************************************************************/
		387
		388	static void
		389	fd_reify (EV_P)
		390	{
		391	int i;
		392
		393	for (i = 0; i < fdchangecnt; ++i)
		394	{
		395	int fd = fdchanges [i];
		396	ANFD *anfd = anfds + fd;
		397	struct ev_io *w;
		398
		399	int events = 0;
		400
		401	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		402	events |= w->events;
		403
		404	anfd->reify = 0;
		405
		406	method_modify (EV_A_ fd, anfd->events, events);
		407	anfd->events = events;
		408	}
		409
		410	fdchangecnt = 0;
		411	}
		412
		413	static void
		414	fd_change (EV_P_ int fd)
		415	{
		416	if (anfds [fd].reify)
		417	return;
		418
		419	anfds [fd].reify = 1;
		420
		421	++fdchangecnt;
		422	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		423	fdchanges [fdchangecnt - 1] = fd;
		424	}
		425
		426	static void
		427	fd_kill (EV_P_ int fd)
		428	{
		429	struct ev_io *w;
		430
		431	while ((w = (struct ev_io *)anfds [fd].head))
		432	{
		433	ev_io_stop (EV_A_ w);
		434	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		435	}
		436	}
		437
		438	static int
		439	fd_valid (int fd)
		440	{
		441	#ifdef WIN32
		442	return !!win32_get_osfhandle (fd);
		443	#else
		444	return fcntl (fd, F_GETFD) != -1;
		445	#endif
		446	}
		447
		448	/* called on EBADF to verify fds */
		449	static void
		450	fd_ebadf (EV_P)
		451	{
		452	int fd;
		453
		454	for (fd = 0; fd < anfdmax; ++fd)
		455	if (anfds [fd].events)
		456	if (!fd_valid (fd) == -1 && errno == EBADF)
		457	fd_kill (EV_A_ fd);
		458	}
		459
		460	/* called on ENOMEM in select/poll to kill some fds and retry */
		461	static void
		462	fd_enomem (EV_P)
		463	{
		464	int fd;
		465
		466	for (fd = anfdmax; fd--; )
		467	if (anfds [fd].events)
		468	{
		469	fd_kill (EV_A_ fd);
		470	return;
131	}	471	}
132	}	472	}
133		473
134	static struct ev_timer **timers;	474	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	475	static void
138	upheap (int k)	476	fd_rearm_all (EV_P)
139	{	477	{
140	struct ev_timer *w = timers [k];	478	int fd;
141		479
		480	/* this should be highly optimised to not do anything but set a flag */
		481	for (fd = 0; fd < anfdmax; ++fd)
		482	if (anfds [fd].events)
		483	{
		484	anfds [fd].events = 0;
		485	fd_change (EV_A_ fd);
		486	}
		487	}
		488
		489	/*****************************************************************************/
		490
		491	static void
		492	upheap (WT *heap, int k)
		493	{
		494	WT w = heap [k];
		495
142	while (k && timers [k >> 1]->at > w->at)	496	while (k && heap [k >> 1]->at > w->at)
143	{	497	{
144	timers [k] = timers [k >> 1];	498	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	499	((W)heap [k])->active = k + 1;
146	k >>= 1;	500	k >>= 1;
147	}	501	}
148		502
149	timers [k] = w;	503	heap [k] = w;
150	timers [k]->active = k + 1;	504	((W)heap [k])->active = k + 1;
151		505
152	}	506	}
153		507
154	static void	508	static void
155	downheap (int k)	509	downheap (WT *heap, int N, int k)
156	{	510	{
157	struct ev_timer *w = timers [k];	511	WT w = heap [k];
158		512
159	while (k < (timercnt >> 1))	513	while (k < (N >> 1))
160	{	514	{
161	int j = k << 1;	515	int j = k << 1;
162		516
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	517	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	518	++j;
165		519
166	if (w->at <= timers [j]->at)	520	if (w->at <= heap [j]->at)
167	break;	521	break;
168		522
169	timers [k] = timers [j];	523	heap [k] = heap [j];
170	timers [k]->active = k + 1;	524	((W)heap [k])->active = k + 1;
171	k = j;	525	k = j;
172	}	526	}
173		527
174	timers [k] = w;	528	heap [k] = w;
175	timers [k]->active = k + 1;	529	((W)heap [k])->active = k + 1;
176	}	530	}
177		531
178	static struct ev_signal **signals;	532	inline void
		533	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		534	{
		535	ev_tstamp old_at = heap [k]->at;
		536	heap [k]->at = at;
		537
		538	if (old_at < at)
		539	downheap (heap, N, k);
		540	else
		541	upheap (heap, k);
		542	}
		543
		544	/*****************************************************************************/
		545
		546	typedef struct
		547	{
		548	WL head;
		549	sig_atomic_t volatile gotsig;
		550	} ANSIG;
		551
		552	static ANSIG *signals;
179	static int signalmax, signalcnt;	553	static int signalmax;
180		554
		555	static int sigpipe [2];
		556	static sig_atomic_t volatile gotsig;
		557	static struct ev_io sigev;
		558
181	static void	559	static void
182	signals_init (struct ev_signal **base, int count)	560	signals_init (ANSIG *base, int count)
183	{	561	{
184	while (count--)	562	while (count--)
185	*base++ = 0;	563	{
186	}	564	base->head = 0;
		565	base->gotsig = 0;
187		566
		567	++base;
		568	}
		569	}
		570
		571	static void
		572	sighandler (int signum)
		573	{
		574	#if WIN32
		575	signal (signum, sighandler);
		576	#endif
		577
		578	signals [signum - 1].gotsig = 1;
		579
		580	if (!gotsig)
		581	{
		582	int old_errno = errno;
		583	gotsig = 1;
		584	#ifdef WIN32
		585	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		586	#else
		587	write (sigpipe [1], &signum, 1);
		588	#endif
		589	errno = old_errno;
		590	}
		591	}
		592
		593	void
		594	ev_feed_signal_event (EV_P_ int signum)
		595	{
		596	WL w;
		597
		598	#if EV_MULTIPLICITY
		599	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		600	#endif
		601
		602	--signum;
		603
		604	if (signum < 0 || signum >= signalmax)
		605	return;
		606
		607	signals [signum].gotsig = 0;
		608
		609	for (w = signals [signum].head; w; w = w->next)
		610	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		611	}
		612
		613	static void
		614	sigcb (EV_P_ struct ev_io *iow, int revents)
		615	{
		616	int signum;
		617
		618	#ifdef WIN32
		619	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		620	#else
		621	read (sigpipe [0], &revents, 1);
		622	#endif
		623	gotsig = 0;
		624
		625	for (signum = signalmax; signum--; )
		626	if (signals [signum].gotsig)
		627	ev_feed_signal_event (EV_A_ signum + 1);
		628	}
		629
		630	static void
		631	siginit (EV_P)
		632	{
		633	#ifndef WIN32
		634	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		635	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		636
		637	/* rather than sort out wether we really need nb, set it */
		638	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		639	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		640	#endif
		641
		642	ev_io_set (&sigev, sigpipe [0], EV_READ);
		643	ev_io_start (EV_A_ &sigev);
		644	ev_unref (EV_A); /* child watcher should not keep loop alive */
		645	}
		646
		647	/*****************************************************************************/
		648
		649	static struct ev_child *childs [PID_HASHSIZE];
		650
		651	#ifndef WIN32
		652
		653	static struct ev_signal childev;
		654
		655	#ifndef WCONTINUED
		656	# define WCONTINUED 0
		657	#endif
		658
		659	static void
		660	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		661	{
		662	struct ev_child *w;
		663
		664	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		665	if (w->pid == pid || !w->pid)
		666	{
		667	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		668	w->rpid = pid;
		669	w->rstatus = status;
		670	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		671	}
		672	}
		673
		674	static void
		675	childcb (EV_P_ struct ev_signal *sw, int revents)
		676	{
		677	int pid, status;
		678
		679	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		680	{
		681	/* make sure we are called again until all childs have been reaped */
		682	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		683
		684	child_reap (EV_A_ sw, pid, pid, status);
		685	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		686	}
		687	}
		688
		689	#endif
		690
		691	/*****************************************************************************/
		692
		693	#if EV_USE_KQUEUE
		694	# include "ev_kqueue.c"
		695	#endif
188	#if HAVE_EPOLL	696	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	697	# include "ev_epoll.c"
190	#endif	698	#endif
		699	#if EV_USE_POLL
		700	# include "ev_poll.c"
		701	#endif
191	#if HAVE_SELECT	702	#if EV_USE_SELECT
192	# include "ev_select.c"	703	# include "ev_select.c"
193	#endif	704	#endif
194		705
195	int ev_init (int flags)	706	int
		707	ev_version_major (void)
196	{	708	{
		709	return EV_VERSION_MAJOR;
		710	}
		711
		712	int
		713	ev_version_minor (void)
		714	{
		715	return EV_VERSION_MINOR;
		716	}
		717
		718	/* return true if we are running with elevated privileges and should ignore env variables */
		719	static int
		720	enable_secure (void)
		721	{
		722	#ifdef WIN32
		723	return 0;
		724	#else
		725	return getuid () != geteuid ()
		726	|| getgid () != getegid ();
		727	#endif
		728	}
		729
		730	int
		731	ev_method (EV_P)
		732	{
		733	return method;
		734	}
		735
		736	static void
		737	loop_init (EV_P_ int methods)
		738	{
		739	if (!method)
		740	{
197	#if HAVE_MONOTONIC	741	#if EV_USE_MONOTONIC
198	{	742	{
199	struct timespec ts;	743	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	744	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	745	have_monotonic = 1;
202	}	746	}
203	#endif	747	#endif
204		748
205	ev_now = ev_time ();	749	ev_rt_now = ev_time ();
		750	mn_now = get_clock ();
		751	now_floor = mn_now;
		752	rtmn_diff = ev_rt_now - mn_now;
206		753
		754	if (methods == EVMETHOD_AUTO)
		755	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		756	methods = atoi (getenv ("LIBEV_METHODS"));
		757	else
		758	methods = EVMETHOD_ANY;
		759
		760	method = 0;
		761	#if EV_USE_WIN32
		762	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		763	#endif
		764	#if EV_USE_KQUEUE
		765	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		766	#endif
207	#if HAVE_EPOLL	767	#if EV_USE_EPOLL
208	if (epoll_init (flags))	768	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	769	#endif
		770	#if EV_USE_POLL
		771	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		772	#endif
211	#if HAVE_SELECT	773	#if EV_USE_SELECT
212	if (select_init (flags))	774	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	775	#endif
215		776
216	ev_method = EVMETHOD_NONE;	777	ev_init (&sigev, sigcb);
217	return ev_method;	778	ev_set_priority (&sigev, EV_MAXPRI);
		779	}
218	}	780	}
219		781
220	void ev_prefork (void)	782	void
221	{	783	loop_destroy (EV_P)
222	}
223
224	void ev_postfork_parent (void)
225	{
226	}
227
228	void ev_postfork_child (void)
229	{
230	#if HAVE_EPOLL
231	epoll_postfork_child ();
232	#endif
233	}
234
235	static void
236	call_pending ()
237	{	784	{
238	int i;	785	int i;
239		786
240	for (i = 0; i < pendingcnt; ++i)	787	#if EV_USE_WIN32
		788	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		789	#endif
		790	#if EV_USE_KQUEUE
		791	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		792	#endif
		793	#if EV_USE_EPOLL
		794	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		795	#endif
		796	#if EV_USE_POLL
		797	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		798	#endif
		799	#if EV_USE_SELECT
		800	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		801	#endif
		802
		803	for (i = NUMPRI; i--; )
		804	array_free (pending, [i]);
		805
		806	/* have to use the microsoft-never-gets-it-right macro */
		807	array_free_microshit (fdchange);
		808	array_free_microshit (timer);
		809	array_free_microshit (periodic);
		810	array_free_microshit (idle);
		811	array_free_microshit (prepare);
		812	array_free_microshit (check);
		813
		814	method = 0;
		815	}
		816
		817	static void
		818	loop_fork (EV_P)
		819	{
		820	#if EV_USE_EPOLL
		821	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		822	#endif
		823	#if EV_USE_KQUEUE
		824	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		825	#endif
		826
		827	if (ev_is_active (&sigev))
		828	{
		829	/* default loop */
		830
		831	ev_ref (EV_A);
		832	ev_io_stop (EV_A_ &sigev);
		833	close (sigpipe [0]);
		834	close (sigpipe [1]);
		835
		836	while (pipe (sigpipe))
		837	syserr ("(libev) error creating pipe");
		838
		839	siginit (EV_A);
241	{	840	}
242	ANPENDING *p = pendings + i;
243		841
244	if (p->w)	842	postfork = 0;
		843	}
		844
		845	#if EV_MULTIPLICITY
		846	struct ev_loop *
		847	ev_loop_new (int methods)
		848	{
		849	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		850
		851	memset (loop, 0, sizeof (struct ev_loop));
		852
		853	loop_init (EV_A_ methods);
		854
		855	if (ev_method (EV_A))
		856	return loop;
		857
		858	return 0;
		859	}
		860
		861	void
		862	ev_loop_destroy (EV_P)
		863	{
		864	loop_destroy (EV_A);
		865	ev_free (loop);
		866	}
		867
		868	void
		869	ev_loop_fork (EV_P)
		870	{
		871	postfork = 1;
		872	}
		873
		874	#endif
		875
		876	#if EV_MULTIPLICITY
		877	struct ev_loop *
		878	#else
		879	int
		880	#endif
		881	ev_default_loop (int methods)
		882	{
		883	if (sigpipe [0] == sigpipe [1])
		884	if (pipe (sigpipe))
		885	return 0;
		886
		887	if (!default_loop)
		888	{
		889	#if EV_MULTIPLICITY
		890	struct ev_loop *loop = default_loop = &default_loop_struct;
		891	#else
		892	default_loop = 1;
		893	#endif
		894
		895	loop_init (EV_A_ methods);
		896
		897	if (ev_method (EV_A))
245	{	898	{
246	p->w->pending = 0;	899	siginit (EV_A);
247	p->w->cb (p->w, p->events);	900
		901	#ifndef WIN32
		902	ev_signal_init (&childev, childcb, SIGCHLD);
		903	ev_set_priority (&childev, EV_MAXPRI);
		904	ev_signal_start (EV_A_ &childev);
		905	ev_unref (EV_A); /* child watcher should not keep loop alive */
		906	#endif
248	}	907	}
		908	else
		909	default_loop = 0;
		910	}
		911
		912	return default_loop;
		913	}
		914
		915	void
		916	ev_default_destroy (void)
		917	{
		918	#if EV_MULTIPLICITY
		919	struct ev_loop *loop = default_loop;
		920	#endif
		921
		922	#ifndef WIN32
		923	ev_ref (EV_A); /* child watcher */
		924	ev_signal_stop (EV_A_ &childev);
		925	#endif
		926
		927	ev_ref (EV_A); /* signal watcher */
		928	ev_io_stop (EV_A_ &sigev);
		929
		930	close (sigpipe [0]); sigpipe [0] = 0;
		931	close (sigpipe [1]); sigpipe [1] = 0;
		932
		933	loop_destroy (EV_A);
		934	}
		935
		936	void
		937	ev_default_fork (void)
		938	{
		939	#if EV_MULTIPLICITY
		940	struct ev_loop *loop = default_loop;
		941	#endif
		942
		943	if (method)
		944	postfork = 1;
		945	}
		946
		947	/*****************************************************************************/
		948
		949	static int
		950	any_pending (EV_P)
		951	{
		952	int pri;
		953
		954	for (pri = NUMPRI; pri--; )
		955	if (pendingcnt [pri])
		956	return 1;
		957
		958	return 0;
		959	}
		960
		961	static void
		962	call_pending (EV_P)
		963	{
		964	int pri;
		965
		966	for (pri = NUMPRI; pri--; )
		967	while (pendingcnt [pri])
		968	{
		969	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		970
		971	if (p->w)
		972	{
		973	p->w->pending = 0;
		974	EV_CB_INVOKE (p->w, p->events);
		975	}
249	}	976	}
250
251	pendingcnt = 0;
252	}	977	}
253		978
254	static void	979	static void
255	timer_reify (void)	980	timers_reify (EV_P)
256	{	981	{
257	while (timercnt && timers [0]->at <= ev_now)	982	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	983	{
259	struct ev_timer *w = timers [0];	984	struct ev_timer *w = timers [0];
260		985
		986	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		987
261	/* first reschedule timer */	988	/* first reschedule or stop timer */
262	if (w->repeat)	989	if (w->repeat)
263	{	990	{
264	if (w->is_abs)	991	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	992
266	else
267	w->at = ev_now + w->repeat;	993	((WT)w)->at += w->repeat;
		994	if (((WT)w)->at < mn_now)
		995	((WT)w)->at = mn_now;
268		996
269	downheap (0);	997	downheap ((WT *)timers, timercnt, 0);
270	}	998	}
271	else	999	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	1000	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		1001
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	1002	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1003	}
		1004	}
		1005
		1006	static void
		1007	periodics_reify (EV_P)
		1008	{
		1009	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
275	}	1010	{
276	}	1011	struct ev_periodic *w = periodics [0];
277		1012
278	int ev_loop_done;	1013	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		1014
		1015	/* first reschedule or stop timer */
		1016	if (w->reschedule_cb)
		1017	{
		1018	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1019
		1020	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1021	downheap ((WT *)periodics, periodiccnt, 0);
		1022	}
		1023	else if (w->interval)
		1024	{
		1025	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1026	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1027	downheap ((WT *)periodics, periodiccnt, 0);
		1028	}
		1029	else
		1030	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1031
		1032	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1033	}
		1034	}
		1035
		1036	static void
		1037	periodics_reschedule (EV_P)
		1038	{
		1039	int i;
		1040
		1041	/* adjust periodics after time jump */
		1042	for (i = 0; i < periodiccnt; ++i)
		1043	{
		1044	struct ev_periodic *w = periodics [i];
		1045
		1046	if (w->reschedule_cb)
		1047	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1048	else if (w->interval)
		1049	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1050	}
		1051
		1052	/* now rebuild the heap */
		1053	for (i = periodiccnt >> 1; i--; )
		1054	downheap ((WT *)periodics, periodiccnt, i);
		1055	}
		1056
		1057	inline int
		1058	time_update_monotonic (EV_P)
		1059	{
		1060	mn_now = get_clock ();
		1061
		1062	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1063	{
		1064	ev_rt_now = rtmn_diff + mn_now;
		1065	return 0;
		1066	}
		1067	else
		1068	{
		1069	now_floor = mn_now;
		1070	ev_rt_now = ev_time ();
		1071	return 1;
		1072	}
		1073	}
		1074
		1075	static void
		1076	time_update (EV_P)
		1077	{
		1078	int i;
		1079
		1080	#if EV_USE_MONOTONIC
		1081	if (expect_true (have_monotonic))
		1082	{
		1083	if (time_update_monotonic (EV_A))
		1084	{
		1085	ev_tstamp odiff = rtmn_diff;
		1086
		1087	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1088	{
		1089	rtmn_diff = ev_rt_now - mn_now;
		1090
		1091	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1092	return; /* all is well */
		1093
		1094	ev_rt_now = ev_time ();
		1095	mn_now = get_clock ();
		1096	now_floor = mn_now;
		1097	}
		1098
		1099	periodics_reschedule (EV_A);
		1100	/* no timer adjustment, as the monotonic clock doesn't jump */
		1101	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1102	}
		1103	}
		1104	else
		1105	#endif
		1106	{
		1107	ev_rt_now = ev_time ();
		1108
		1109	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1110	{
		1111	periodics_reschedule (EV_A);
		1112
		1113	/* adjust timers. this is easy, as the offset is the same for all */
		1114	for (i = 0; i < timercnt; ++i)
		1115	((WT)timers [i])->at += ev_rt_now - mn_now;
		1116	}
		1117
		1118	mn_now = ev_rt_now;
		1119	}
		1120	}
		1121
		1122	void
		1123	ev_ref (EV_P)
		1124	{
		1125	++activecnt;
		1126	}
		1127
		1128	void
		1129	ev_unref (EV_P)
		1130	{
		1131	--activecnt;
		1132	}
		1133
		1134	static int loop_done;
		1135
		1136	void
280	int ev_loop (int flags)	1137	ev_loop (EV_P_ int flags)
281	{	1138	{
282	double block;	1139	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1140	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1141
285	do	1142	do
286	{	1143	{
		1144	/* queue check watchers (and execute them) */
		1145	if (expect_false (preparecnt))
		1146	{
		1147	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1148	call_pending (EV_A);
		1149	}
		1150
		1151	/* we might have forked, so reify kernel state if necessary */
		1152	if (expect_false (postfork))
		1153	loop_fork (EV_A);
		1154
287	/* update fd-related kernel structures */	1155	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1156	fd_reify (EV_A);
289		1157
290	/* calculate blocking time */	1158	/* calculate blocking time */
		1159
		1160	/* we only need this for !monotonic clock or timers, but as we basically
		1161	always have timers, we just calculate it always */
		1162	#if EV_USE_MONOTONIC
		1163	if (expect_true (have_monotonic))
		1164	time_update_monotonic (EV_A);
		1165	else
		1166	#endif
		1167	{
291	ev_now = ev_time ();	1168	ev_rt_now = ev_time ();
		1169	mn_now = ev_rt_now;
		1170	}
292		1171
293	if (flags & EVLOOP_NONBLOCK)	1172	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1173	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1174	else
298	{	1175	{
		1176	block = MAX_BLOCKTIME;
		1177
		1178	if (timercnt)
		1179	{
299	block = timers [0]->at - ev_now + method_fudge;	1180	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1181	if (block > to) block = to;
		1182	}
		1183
		1184	if (periodiccnt)
		1185	{
		1186	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
		1187	if (block > to) block = to;
		1188	}
		1189
300	if (block < 0.) block = 0.;	1190	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1191	}
303		1192
304	method_poll (block);	1193	method_poll (EV_A_ block);
305		1194
		1195	/* update ev_rt_now, do magic */
		1196	time_update (EV_A);
		1197
306	/* put pending timers into pendign queue and reschedule them */	1198	/* queue pending timers and reschedule them */
307	timer_reify ();	1199	timers_reify (EV_A); /* relative timers called last */
		1200	periodics_reify (EV_A); /* absolute timers called first */
308		1201
309	ev_now = ev_time ();	1202	/* queue idle watchers unless io or timers are pending */
		1203	if (idlecnt && !any_pending (EV_A))
		1204	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1205
		1206	/* queue check watchers, to be executed first */
		1207	if (checkcnt)
		1208	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1209
310	call_pending ();	1210	call_pending (EV_A);
311	}	1211	}
312	while (!ev_loop_done);	1212	while (activecnt && !loop_done);
313	}
314		1213
315	static void	1214	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1215	loop_done = 0;
		1216	}
		1217
		1218	void
		1219	ev_unloop (EV_P_ int how)
		1220	{
		1221	loop_done = how;
		1222	}
		1223
		1224	/*****************************************************************************/
		1225
		1226	inline void
		1227	wlist_add (WL *head, WL elem)
317	{	1228	{
318	elem->next = *head;	1229	elem->next = *head;
319	*head = elem;	1230	*head = elem;
320	}	1231	}
321		1232
322	static void	1233	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1234	wlist_del (WL *head, WL elem)
324	{	1235	{
325	while (*head)	1236	while (*head)
326	{	1237	{
327	if (*head == elem)	1238	if (*head == elem)
328	{	1239	{
…		…
332		1243
333	head = &(*head)->next;	1244	head = &(*head)->next;
334	}	1245	}
335	}	1246	}
336		1247
337	static void	1248	inline void
338	ev_start (struct ev_watcher *w, int active)	1249	ev_clear_pending (EV_P_ W w)
339	{	1250	{
		1251	if (w->pending)
		1252	{
		1253	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1254	w->pending = 0;
		1255	}
		1256	}
		1257
		1258	inline void
		1259	ev_start (EV_P_ W w, int active)
		1260	{
		1261	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1262	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1263
341	w->active = active;	1264	w->active = active;
		1265	ev_ref (EV_A);
342	}	1266	}
343		1267
344	static void	1268	inline void
345	ev_stop (struct ev_watcher *w)	1269	ev_stop (EV_P_ W w)
346	{	1270	{
347	if (w->pending)	1271	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1272	w->active = 0;
351	/* nop */
352	}	1273	}
353		1274
		1275	/*****************************************************************************/
		1276
354	void	1277	void
355	evio_start (struct ev_io *w)	1278	ev_io_start (EV_P_ struct ev_io *w)
356	{	1279	{
		1280	int fd = w->fd;
		1281
357	if (ev_is_active (w))	1282	if (ev_is_active (w))
358	return;	1283	return;
359		1284
360	int fd = w->fd;	1285	assert (("ev_io_start called with negative fd", fd >= 0));
361		1286
362	ev_start ((struct ev_watcher *)w, 1);	1287	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1288	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1289	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1290
366	++fdchangecnt;	1291	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1292	}
370		1293
371	void	1294	void
372	evio_stop (struct ev_io *w)	1295	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1296	{
		1297	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1298	if (!ev_is_active (w))
375	return;	1299	return;
376		1300
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1301	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
378	ev_stop ((struct ev_watcher *)w);
379		1302
380	++fdchangecnt;	1303	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1304	ev_stop (EV_A_ (W)w);
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}
384		1305
		1306	fd_change (EV_A_ w->fd);
		1307	}
		1308
385	void	1309	void
386	evtimer_start (struct ev_timer *w)	1310	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1311	{
388	if (ev_is_active (w))	1312	if (ev_is_active (w))
389	return;	1313	return;
390		1314
391	if (w->is_abs)	1315	((WT)w)->at += mn_now;
		1316
		1317	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1318
		1319	ev_start (EV_A_ (W)w, ++timercnt);
		1320	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1321	timers [timercnt - 1] = w;
		1322	upheap ((WT *)timers, timercnt - 1);
		1323
		1324	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1325	}
		1326
		1327	void
		1328	ev_timer_stop (EV_P_ struct ev_timer *w)
		1329	{
		1330	ev_clear_pending (EV_A_ (W)w);
		1331	if (!ev_is_active (w))
		1332	return;
		1333
		1334	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1335
		1336	if (((W)w)->active < timercnt--)
		1337	{
		1338	timers [((W)w)->active - 1] = timers [timercnt];
		1339	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
392	{	1340	}
393	/* this formula differs from the one in timer_reify becuse we do not round up */	1341
		1342	((WT)w)->at -= mn_now;
		1343
		1344	ev_stop (EV_A_ (W)w);
		1345	}
		1346
		1347	void
		1348	ev_timer_again (EV_P_ struct ev_timer *w)
		1349	{
		1350	if (ev_is_active (w))
		1351	{
394	if (w->repeat)	1352	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1353	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
		1354	else
		1355	ev_timer_stop (EV_A_ w);
		1356	}
		1357	else if (w->repeat)
		1358	ev_timer_start (EV_A_ w);
		1359	}
		1360
		1361	void
		1362	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1363	{
		1364	if (ev_is_active (w))
		1365	return;
		1366
		1367	if (w->reschedule_cb)
		1368	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1369	else if (w->interval)
396	}	1370	{
		1371	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1372	/* this formula differs from the one in periodic_reify because we do not always round up */
		1373	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1374	}
		1375
		1376	ev_start (EV_A_ (W)w, ++periodiccnt);
		1377	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1378	periodics [periodiccnt - 1] = w;
		1379	upheap ((WT *)periodics, periodiccnt - 1);
		1380
		1381	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1382	}
		1383
		1384	void
		1385	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1386	{
		1387	ev_clear_pending (EV_A_ (W)w);
		1388	if (!ev_is_active (w))
		1389	return;
		1390
		1391	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1392
		1393	if (((W)w)->active < periodiccnt--)
		1394	{
		1395	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1396	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1397	}
		1398
		1399	ev_stop (EV_A_ (W)w);
		1400	}
		1401
		1402	void
		1403	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1404	{
		1405	/* TODO: use adjustheap and recalculation */
		1406	ev_periodic_stop (EV_A_ w);
		1407	ev_periodic_start (EV_A_ w);
		1408	}
		1409
		1410	void
		1411	ev_idle_start (EV_P_ struct ev_idle *w)
		1412	{
		1413	if (ev_is_active (w))
		1414	return;
		1415
		1416	ev_start (EV_A_ (W)w, ++idlecnt);
		1417	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1418	idles [idlecnt - 1] = w;
		1419	}
		1420
		1421	void
		1422	ev_idle_stop (EV_P_ struct ev_idle *w)
		1423	{
		1424	ev_clear_pending (EV_A_ (W)w);
		1425	if (ev_is_active (w))
		1426	return;
		1427
		1428	idles [((W)w)->active - 1] = idles [--idlecnt];
		1429	ev_stop (EV_A_ (W)w);
		1430	}
		1431
		1432	void
		1433	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1434	{
		1435	if (ev_is_active (w))
		1436	return;
		1437
		1438	ev_start (EV_A_ (W)w, ++preparecnt);
		1439	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1440	prepares [preparecnt - 1] = w;
		1441	}
		1442
		1443	void
		1444	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1445	{
		1446	ev_clear_pending (EV_A_ (W)w);
		1447	if (ev_is_active (w))
		1448	return;
		1449
		1450	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1451	ev_stop (EV_A_ (W)w);
		1452	}
		1453
		1454	void
		1455	ev_check_start (EV_P_ struct ev_check *w)
		1456	{
		1457	if (ev_is_active (w))
		1458	return;
		1459
		1460	ev_start (EV_A_ (W)w, ++checkcnt);
		1461	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1462	checks [checkcnt - 1] = w;
		1463	}
		1464
		1465	void
		1466	ev_check_stop (EV_P_ struct ev_check *w)
		1467	{
		1468	ev_clear_pending (EV_A_ (W)w);
		1469	if (ev_is_active (w))
		1470	return;
		1471
		1472	checks [((W)w)->active - 1] = checks [--checkcnt];
		1473	ev_stop (EV_A_ (W)w);
		1474	}
		1475
		1476	#ifndef SA_RESTART
		1477	# define SA_RESTART 0
		1478	#endif
		1479
		1480	void
		1481	ev_signal_start (EV_P_ struct ev_signal *w)
		1482	{
		1483	#if EV_MULTIPLICITY
		1484	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1485	#endif
		1486	if (ev_is_active (w))
		1487	return;
		1488
		1489	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1490
		1491	ev_start (EV_A_ (W)w, 1);
		1492	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1493	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1494
		1495	if (!((WL)w)->next)
		1496	{
		1497	#if WIN32
		1498	signal (w->signum, sighandler);
		1499	#else
		1500	struct sigaction sa;
		1501	sa.sa_handler = sighandler;
		1502	sigfillset (&sa.sa_mask);
		1503	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1504	sigaction (w->signum, &sa, 0);
		1505	#endif
		1506	}
		1507	}
		1508
		1509	void
		1510	ev_signal_stop (EV_P_ struct ev_signal *w)
		1511	{
		1512	ev_clear_pending (EV_A_ (W)w);
		1513	if (!ev_is_active (w))
		1514	return;
		1515
		1516	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1517	ev_stop (EV_A_ (W)w);
		1518
		1519	if (!signals [w->signum - 1].head)
		1520	signal (w->signum, SIG_DFL);
		1521	}
		1522
		1523	void
		1524	ev_child_start (EV_P_ struct ev_child *w)
		1525	{
		1526	#if EV_MULTIPLICITY
		1527	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1528	#endif
		1529	if (ev_is_active (w))
		1530	return;
		1531
		1532	ev_start (EV_A_ (W)w, 1);
		1533	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1534	}
		1535
		1536	void
		1537	ev_child_stop (EV_P_ struct ev_child *w)
		1538	{
		1539	ev_clear_pending (EV_A_ (W)w);
		1540	if (ev_is_active (w))
		1541	return;
		1542
		1543	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1544	ev_stop (EV_A_ (W)w);
		1545	}
		1546
		1547	/*****************************************************************************/
		1548
		1549	struct ev_once
		1550	{
		1551	struct ev_io io;
		1552	struct ev_timer to;
		1553	void (*cb)(int revents, void *arg);
		1554	void *arg;
		1555	};
		1556
		1557	static void
		1558	once_cb (EV_P_ struct ev_once *once, int revents)
		1559	{
		1560	void (*cb)(int revents, void *arg) = once->cb;
		1561	void *arg = once->arg;
		1562
		1563	ev_io_stop (EV_A_ &once->io);
		1564	ev_timer_stop (EV_A_ &once->to);
		1565	ev_free (once);
		1566
		1567	cb (revents, arg);
		1568	}
		1569
		1570	static void
		1571	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1572	{
		1573	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1574	}
		1575
		1576	static void
		1577	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1578	{
		1579	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1580	}
		1581
		1582	void
		1583	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1584	{
		1585	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1586
		1587	if (!once)
		1588	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
397	else	1589	else
398	w->at += ev_now;
399
400	ev_start ((struct ev_watcher *)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);
404	}
405
406	void
407	evtimer_stop (struct ev_timer *w)
408	{
409	if (!ev_is_active (w))
410	return;
411
412	if (w->active < timercnt--)
413	{
414	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);
416	}	1590	{
		1591	once->cb = cb;
		1592	once->arg = arg;
417		1593
418	ev_stop ((struct ev_watcher *)w);	1594	ev_init (&once->io, once_cb_io);
419	}	1595	if (fd >= 0)
		1596	{
		1597	ev_io_set (&once->io, fd, events);
		1598	ev_io_start (EV_A_ &once->io);
		1599	}
420		1600
421	void	1601	ev_init (&once->to, once_cb_to);
422	evsignal_start (struct ev_signal *w)	1602	if (timeout >= 0.)
423	{	1603	{
424	if (ev_is_active (w))	1604	ev_timer_set (&once->to, timeout, 0.);
425	return;	1605	ev_timer_start (EV_A_ &once->to);
426		1606	}
427	ev_start ((struct ev_watcher *)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
430	}
431
432	void
433	evsignal_stop (struct ev_signal *w)
434	{
435	if (!ev_is_active (w))
436	return;
437
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
439	ev_stop ((struct ev_watcher *)w);
440	}
441
442	/*****************************************************************************/
443	#if 1
444
445	static void
446	sin_cb (struct ev_io *w, int revents)
447	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}
450
451	static void
452	ocb (struct ev_timer *w, int revents)
453	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
455	}
456
457	int main (void)
458	{
459	struct ev_io sin;
460
461	ev_init (0);
462
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);
465	evio_start (&sin);
466
467	struct ev_timer t[1000];
468
469	int i;
470	for (i = 0; i < 1000; ++i)
471	{	1607	}
472	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);
475	evtimer_start (w);
476	if (drand48 () < 0.5)
477	evtimer_stop (w);
478	}
479
480	ev_loop (0);
481
482	return 0;
483	}	1608	}
484		1609
		1610	#ifdef __cplusplus
		1611	}
485	#endif	1612	#endif
486		1613
487
488
489

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